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油菜菌核病是我县油菜生产的严重障碍。往年种植白菜型油菜,发病株率一般为20—50%,严重的达80%以上,病情指数一般为15—30%,严重的60%以上;1979年以后,全县大面积推广了甘兰型油菜西南302,抗病性较强,病株率一般为10—20%,严重的50—70%,病情指数一般为5—10%,严重的40—50%。发病的油菜整株或分枝枯死,籽粒干瘪,千粒重明显下降。1966年测定白菜型油菜千粒重,无病株为3.21克,病株仅2.15克,
Rape sclerotinia is a serious obstacle to rapeseed production in our county. In previous years planted cabbage rape, the incidence of strains is generally 20-50%, severe up to 80% or more, the disease index is generally 15-30%, severe 60% or more; after 1979, the county large-scale promotion of kalan The rapeseed southwestern 302, the disease resistance is strong, the diseased plant rate is generally 10-20%, the serious 50-70%, the disease index is generally 5-10%, the serious 40-50%. The incidence of whole rapeseed or branching withered, shriveled grain, grain weight decreased significantly. In 1966, the determination of 1000-kernel weight of Brassica campestris, diseased plants was 3.21 grams, diseased plants only 2.15 grams,